A touch of hair on one side of the scalp hurts, may be related to scalp trauma, may also be due to herpes zoster, folliculitis and other causes. 1. Scalp trauma: If the scalp is traumatized due to an accidental bump, in this case, touching the hair may happen to touch the scalp where the trauma exists, which may cause pain on one side of the scalp, and may also be accompanied by localized swelling, bruising and other manifestations. 2. Herpes zoster: usually due to low immunity, the latent varicella-zoster virus to obtain the conditions for reactivation, repeat infection, can lead to the affected area of the skin appear clustered distribution of blisters. It occurs in the head, face, neck, waist and other parts of the body, which may lead to more blisters in the scalp area. If the blisters are touched when touching the hair, it may cause pain on one side of the scalp. 3. Folliculitis: caused by the proliferation of fungi and bacteria in the hair follicles, inducing folliculitis of the scalp, with pimples and herpes around the hair follicles, accompanied by itching, pain, fever and other symptoms. Touching the hair in this case may cause pain in the scalp at the site of touching. A touch of hair on one side of the scalp pain, if accompanied by other uncomfortable symptoms, should be as early as possible to seek medical attention, after diagnosis, to give targeted treatment.